path: root/engines/e_ossltest.c

/*
 * Copyright 2015-2022 The OpenSSL Project Authors. All Rights Reserved.
 *
 * Licensed under the Apache License 2.0 (the "License").  You may not use
 * this file except in compliance with the License.  You can obtain a copy
 * in the file LICENSE in the source distribution or at
 * https://www.openssl.org/source/license.html
 */

/*
 * This is the OSSLTEST engine. It provides deliberately crippled digest
 * implementations for test purposes. It is highly insecure and must NOT be
 * used for any purpose except testing
 */

/* We need to use some engine deprecated APIs */
#define OPENSSL_SUPPRESS_DEPRECATED

/*
 * SHA low level APIs are deprecated for public use, but still ok for
 * internal use.  Note, that due to symbols not being exported, only the
 * #defines and type definitions can be accessed, function calls are not
 * available.  The digest lengths, block sizes and sizeof(CTX) are used herein
 * for several different digests.
 */
#include "internal/deprecated.h"

#include <stdio.h>
#include <string.h>

#include <openssl/engine.h>
#include <openssl/sha.h>
#include <openssl/md5.h>
#include <openssl/rsa.h>
#include <openssl/evp.h>
#include <openssl/modes.h>
#include <openssl/aes.h>
#include <openssl/rand.h>
#include <openssl/crypto.h>
#include <openssl/pem.h>
#include <crypto/evp.h>

#include "e_ossltest_err.c"

/* Engine Id and Name */
static const char *engine_ossltest_id = "ossltest";
static const char *engine_ossltest_name = "OpenSSL Test engine support";


/* Engine Lifetime functions */
static int ossltest_destroy(ENGINE *e);
static int ossltest_init(ENGINE *e);
static int ossltest_finish(ENGINE *e);
void ENGINE_load_ossltest(void);


/* Set up digests */
static int ossltest_digests(ENGINE *e, const EVP_MD **digest,
                          const int **nids, int nid);
static const RAND_METHOD *ossltest_rand_method(void);

/* MD5 */
static int digest_md5_init(EVP_MD_CTX *ctx);
static int digest_md5_update(EVP_MD_CTX *ctx, const void *data,
                             size_t count);
static int digest_md5_final(EVP_MD_CTX *ctx, unsigned char *md);

static EVP_MD *_hidden_md5_md = NULL;
static const EVP_MD *digest_md5(void)
{
    if (_hidden_md5_md == NULL) {
        EVP_MD *md;

        if ((md = EVP_MD_meth_new(NID_md5, NID_md5WithRSAEncryption)) == NULL
            || !EVP_MD_meth_set_result_size(md, MD5_DIGEST_LENGTH)
            || !EVP_MD_meth_set_input_blocksize(md, MD5_CBLOCK)
            || !EVP_MD_meth_set_app_datasize(md,
                                             sizeof(EVP_MD *) + sizeof(MD5_CTX))
            || !EVP_MD_meth_set_flags(md, 0)
            || !EVP_MD_meth_set_init(md, digest_md5_init)
            || !EVP_MD_meth_set_update(md, digest_md5_update)
            || !EVP_MD_meth_set_final(md, digest_md5_final)) {
            EVP_MD_meth_free(md);
            md = NULL;
        }
        _hidden_md5_md = md;
    }
    return _hidden_md5_md;
}

/* SHA1 */
static int digest_sha1_init(EVP_MD_CTX *ctx);
static int digest_sha1_update(EVP_MD_CTX *ctx, const void *data,
                              size_t count);
static int digest_sha1_final(EVP_MD_CTX *ctx, unsigned char *md);

static EVP_MD *_hidden_sha1_md = NULL;
static const EVP_MD *digest_sha1(void)
{
    if (_hidden_sha1_md == NULL) {
        EVP_MD *md;

        if ((md = EVP_MD_meth_new(NID_sha1, NID_sha1WithRSAEncryption)) == NULL
            || !EVP_MD_meth_set_result_size(md, SHA_DIGEST_LENGTH)
            || !EVP_MD_meth_set_input_blocksize(md, SHA_CBLOCK)
            || !EVP_MD_meth_set_app_datasize(md,
                                             sizeof(EVP_MD *) + sizeof(SHA_CTX))
            || !EVP_MD_meth_set_flags(md, EVP_MD_FLAG_DIGALGID_ABSENT)
            || !EVP_MD_meth_set_init(md, digest_sha1_init)
            || !EVP_MD_meth_set_update(md, digest_sha1_update)
            || !EVP_MD_meth_set_final(md, digest_sha1_final)) {
            EVP_MD_meth_free(md);
            md = NULL;
        }
        _hidden_sha1_md = md;
    }
    return _hidden_sha1_md;
}

/* SHA256 */
static int digest_sha256_init(EVP_MD_CTX *ctx);
static int digest_sha256_update(EVP_MD_CTX *ctx, const void *data,
                                size_t count);
static int digest_sha256_final(EVP_MD_CTX *ctx, unsigned char *md);

static EVP_MD *_hidden_sha256_md = NULL;
static const EVP_MD *digest_sha256(void)
{
    if (_hidden_sha256_md == NULL) {
        EVP_MD *md;

        if ((md = EVP_MD_meth_new(NID_sha256, NID_sha256WithRSAEncryption)) == NULL
            || !EVP_MD_meth_set_result_size(md, SHA256_DIGEST_LENGTH)
            || !EVP_MD_meth_set_input_blocksize(md, SHA256_CBLOCK)
            || !EVP_MD_meth_set_app_datasize(md,
                                             sizeof(EVP_MD *) + sizeof